{"id":"CVE-2026-27191","aliases":["EUVD-2026-7743","GHSA-ppf9-4ffw-hh4p"],"status":"published","title":"Feathers: Open Redirect in OAuth callback enables account takeover","description":"Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.","severity":{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00293,"percentile":0.22091,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2026-02-19T20:32:15Z","modified":"2026-10-28T02:30:56Z","fixes":[{"ecosystem":"npm","package":"@feathersjs/authentication-oauth","fixed_in":["5.0.40"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@feathersjs/authentication-oauth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.0.39"},{"fixed":"5.0.40"}]}]},{"source":"osv","ecosystem":"npm","package":"@feathersjs/authentication-oauth","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.0.40"}]}]}],"products":[{"vendor":"feathersjs","product":"feathers"}],"references":[{"url":"https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p","tags":["x_refsource_CONFIRM","Third Party Advisory","advisory","web"]},{"url":"https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/feathersjs/feathers/releases/tag/v5.0.40","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27191","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-ppf9-4ffw-hh4p"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27191.json","tags":["advisory"]},{"url":"https://github.com/feathersjs/feathers","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-27191","title":"Feathers: Open Redirect in OAuth callback enables account takeover","description":"Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.","status":"published","published":"2026-02-21T03:23:28.34Z","modified":"2026-02-25T21:24:54.98Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:19:48.826324Z"}],"euvd":[{"id":"EUVD-2026-7743","description":"Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.","status":"published","published":"2026-02-21T03:23:28Z","modified":"2026-02-25T21:24:54Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:48:28.012266Z"}],"ghsa":[{"id":"GHSA-ppf9-4ffw-hh4p","title":"Feathers has an open redirect in OAuth callback enables account takeover","description":"### Description\n\nThe `redirect` query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them.\n\nThe application constructs the final redirect URL by concatenating the base origin with the user-supplied `redirect` parameter:\n```javascript\n// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/service.ts#L158C3-L176C4\nconst { redirect } = query;\n...\nsession.redirect = redirect;\n\n// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/strategy.ts#L98\nconst redirectUrl = `${redirect}${queryRedirect}`;\n```\n\nWhere:\n- `redirect` = base origin from config (e.g., `https://target.com`)\n- `queryRedirect` = user input from `?redirect=` parameter\n\nThis is exploitable when the `origins` array is configured and origin values do not end with `/`.  An attacker can supply `@attacker.com` as the redirect value results in `https://target.com@attacker.com#access_token=...`, where the browser interprets `attacker.com` as the host, leading to full account takeover.\n\n**Credits**:  Abdelwahed Madani Yousfi (@vvxhid) / Edoardo Geraci (@b0-n0-b0) / Thomas Rinsma (@ThomasRinsma) From Codean Labs.","status":"published","published":"2026-02-19T20:32:15Z","modified":"2026-02-23T22:26:31Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:39:26.881079Z"}],"nvd":[{"id":"CVE-2026-27191","description":"Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.","status":"published","published":"2026-02-21T04:15:58.493Z","modified":"2026-06-17T10:26:49.27Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:12:06.63895Z"}],"osv":[{"id":"CVE-2026-27191","title":"Feathers: Open Redirect in OAuth callback enables account takeover","description":"Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.","status":"published","published":"2026-02-21T03:23:28.34Z","modified":"2026-10-28T02:30:56.916571746Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:44:59.80315Z"},{"id":"GHSA-ppf9-4ffw-hh4p","title":"Feathers has an open redirect in OAuth callback enables account takeover","description":"### Description\n\nThe `redirect` query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them.\n\nThe application constructs the final redirect URL by concatenating the base origin with the user-supplied `redirect` parameter:\n```javascript\n// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/service.ts#L158C3-L176C4\nconst { redirect } = query;\n...\nsession.redirect = redirect;\n\n// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/strategy.ts#L98\nconst redirectUrl = `${redirect}${queryRedirect}`;\n```\n\nWhere:\n- `redirect` = base origin from config (e.g., `https://target.com`)\n- `queryRedirect` = user input from `?redirect=` parameter\n\nThis is exploitable when the `origins` array is configured and origin values do not end with `/`.  An attacker can supply `@attacker.com` as the redirect value results in `https://target.com@attacker.com#access_token=...`, where the browser interprets `attacker.com` as the host, leading to full account takeover.\n\n**Credits**:  Abdelwahed Madani Yousfi (@vvxhid) / Edoardo Geraci (@b0-n0-b0) / Thomas Rinsma (@ThomasRinsma) From Codean Labs.","status":"published","published":"2026-02-19T20:32:15Z","modified":"2026-02-23T23:43:54.686822Z","cvss":[{"version":"4.0","score":7.4,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:53.244788Z"}]}}